Paragraph 2
Astronaut pee and moon
could save a lot of
. It costs about $10,000 to take 0.45kg of materials to the Moon. The urine and moon dust would be a
way of building
. A scientist said: "A waste
, such as the urine of the
who occupy the moon bases, could be used." She added: "The
water in the urine could be used for the
, together with [water] that can be obtained on the Moon." Scientists say there is
on the Moon. The scientists say they need to do
tests to find the best building material.
